I've recently been wanting to learn more about LINQ for NHibernate.
I like to see lots of examples when learning, but was having difficulties finding any.
The best examples I've seen are the NHibernate.Linq test fixtures, included in the source code (thanks to Ayende for writing a comprehensive set!).
To get this on your machine, just check out the source code using:
svn co https://nhcontrib.svn.sourceforge.net/svnroot/nhcontrib nhcontrib
(look in the /src/NHibernate.Linq folder)
Or, if you want to quickly browse the LINQ examples, then look at these: